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Gary & Millie, the mountains you're visiting, must be over 2000 feet above sea level and that's what's affecting your gas grill.The lower oxygen level and lower air pressure affects propane fueled grills. On larger gas appliances, the gas pressure can be adjusted to overcome this problem. But, I don't believe you can do that on a portable gas grill. My best suggestion is to contact Coleman Customer Support at 800-835-3278, to find out if they have another regulator that can be used in high altitude applications.
As far as how to lower: Step (and hold down) the foot pedal, while holding the pedal down, push the grill down evenly on both sides at the same time. Let off the pedal when the grill is all the way down. I have two of these grills and love them. One will not stay down and I am working through that now. I'll post if I figure out the adjustment. Happy grilling, Don
Sir, we service allot of patio heaters in the US and distribute them as well. We, however do not sell to Costco, and I am sorry that you are having these problems. Please feel free to call our company anytime you would like, and we can try to handle your needs. We sell our regulator for $14.85 and offer free shipping to all of our customers. If you would like, please visit our web site at azpatioheaters.com or call 623-875-1330, and any person that answers is fully equipt to assist you.
Most major hardware stores that sell grills have a universal conversion quick connect hose and gas line adapter fitting. That.. you can probably handle. Next you need to install a quick connect adapter from the house gas line or meter (unless one is already there for you). Otherwise you may want to call your local gas company or fireplace/grill store to send someone out.
Last all LP to NG conversions require the orifices on the back of your grill's valves to be changed to larger holes. (LP has more pressure thus small holes and NG must be larger.) The trick is getting the precise numbered drill bit diameter(45-55) for your particular grill. You can look on your manufacturers web site to provide this info. Often times they can sell you a new set of orifices, predrilled, to the exact diameter for conversion. Drilling out orifices is usually cheaper and pretty easy if you know where to find the bits (internet or specialty tool store). Sometimes your local gas company or fireplace/grill shop will provide this service as well.
Hope this helps, and good luck.